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Geometry: Areas of Triangles

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Chapter 9.1 C

Geometry: Areas of Triangles

Triangles are pretty much just parallelograms cut in HALF

There are 2 formulas for triangles

A = ½ b x h

A = b x h

H

E

I

G

H

T

2

BASE

H

E

I

G

H

T

On some triangles the height IS part of the shape!!!

BASE

7 in.

6 in.

8 in.

4.2 in

ALWAYS write the formula, then plug in the numbers!

A = ½ b x h

A = ½ 4.2 x 7

A = ½ b x h

A = ½ 8 x 6

A = 14.7 in2

A = 24 in2

Area is always labeled in “square” measures

A = 36 ft2

h

12 ft.

Since we know the AREA already, work the problem backwards to find the height!

A = ½ (b x h)

36 = ½ (12 x h)

36 x 2

72 = 12 x h

72 / 12

6 = h